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Arrange the following solutions in order of their increasing boiling points.
(i) $10^{- 4}$ MNaCl
(ii) $10^{- 4}$ M Urea
(iii) $10^{- 3}$ MNaCl
(iv) $10^{- 2}$ MNaCl

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(ii) < (i) < (iii) < (iv)

(ii) < (i) ≅ (iii) < (iv)

(i) < (ii) < (iii) < (iv)

(iv) < (iii) < (i) < (ii)

answer is A.

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Detailed Solution

${ΔT}_{b} = {iK}_{b} . m . \propto i . C .$

where C = concentration

Options	i.C.
(i)	$2 \times 10^{- 4}$
(ii)	$1 \times 10^{- 4}$
(iii)	$2 \times 10^{- 3}$
(iv)	$2 \times 10^{- 2}$

B.P. order : (ii) < (i) < (iii) < (iv)

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